Identify A, B and C in the given diagram and write one function of each.

What is placenta? Describe its two major functions.

What is DNA copying? State its importance.

How are the modes for reproduction different in unicellular and multicellular organisms?

Describe the grafting method for the artificial propagation of plants with the help of labelled diagrams.

Draw a neat diagram of a flower showing its various parts. In this diagram mark stem, receptacle, sepals, petals, stamen and carpel.

List and explain in brief three methods of contraception.

Write one main difference between asexual and sexual mode of reproduction. Which species is likely to have comparatively better chances of survival – the one reproducing asexually or the one reproducing sexually? Give reason to justify your answer.

How do variations arise in organisms? ‘‘Variation is useful for the survival of species.’’ Justify this statement with the help of an example.

List three techniques that have been developed to prevent pregnancy. Which one of these techniques is not meant for males? How does the use of these techniques have a direct impact on the health and prosperity of a family?